Perform the following tasks on all nodes in the cluster!

You will be using OCFS2 to store the files required to be shared for the Oracle Clusterware software. When using OCFS2, the UID of the UNIX user oracle and GID of the UNIX group dba should be identical on all machines in the cluster. If either the UID or GID are different, the files on the OCFS file system may show up as "unowned" or may even be owned by a different user. For this article, I will use 175 for the oracle UID and 115 for the dba GID.

Create Group and User for Oracle

Let's continue our example by creating the Unix dba group and oracle user account along with all appropriate directories.

# mkdir -p /u01/app
# groupadd -g 115 dba
# useradd -u 175 -g 115 -d /u01/app/oracle -s /bin/bash -c "Oracle Software Owner" -p oracle oracle
# chown -R oracle:dba /u01
# passwd oracle
# su - oracle

Note: When you are setting the Oracle environment variables for each RAC node, ensure to assign each RAC node a unique Oracle SID! For this example, I used:

• linux1 : ORACLE_SID=orcl1
• linux2 : ORACLE_SID=orcl2

....................................

# .bash_profile

# Get the aliases and functions
if [ -f ~/.bashrc ]; then
      . ~/.bashrc
fi

alias ls="ls -FA"

# User specific environment and startup programs
export ORACLE_BASE=/u01/app/oracle
export ORACLE_HOME=$ORACLE_BASE/product/10.2.0/db_1
export ORA_CRS_HOME=$ORACLE_BASE/product/crs
export ORACLE_PATH=$ORACLE_BASE/common/oracle/sql:.:$ORACLE_HOME/rdbms/admin

# Each RAC node must have a unique ORACLE_SID. (i.e. orcl1, orcl2,...)
export ORACLE_SID=orcl1

export PATH=.:${PATH}:$HOME/bin:$ORACLE_HOME/bin
export PATH=${PATH}:/usr/bin:/bin:/usr/bin/X11:/usr/local/bin
export PATH=${PATH}:$ORACLE_BASE/common/oracle/bin
export ORACLE_TERM=xterm
export TNS_ADMIN=$ORACLE_HOME/network/admin
export ORA_NLS10=$ORACLE_HOME/nls/data
export LD_LIBRARY_PATH=$ORACLE_HOME/lib
export LD_LIBRARY_PATH=${LD_LIBRARY_PATH}:$ORACLE_HOME/oracm/lib
export LD_LIBRARY_PATH=${LD_LIBRARY_PATH}:/lib:/usr/lib:/usr/local/lib
export CLASSPATH=$ORACLE_HOME/JRE
export CLASSPATH=${CLASSPATH}:$ORACLE_HOME/jlib
export CLASSPATH=${CLASSPATH}:$ORACLE_HOME/rdbms/jlib
export CLASSPATH=${CLASSPATH}:$ORACLE_HOME/network/jlib
export THREADS_FLAG=native
export TEMP=/tmp
export TMPDIR=/tmp

....................................

Create Mount Point for OCFS2 / Clusterware

Finally, create the mount point for the OCFS2 filesystem that will be used to store the two Oracle Clusterware shared files. These commands will need to be run as the "root" user account:

$ su -
# mkdir -p /u02/oradata/orcl
# chown -R oracle:dba /u02

Ensure Adequate temp Space for OUI

Note: The Oracle Universal Installer (OUI) requires at most 400MB of free space in the /tmp directory.

You can check the available space in /tmp by running the following command:

# cat /proc/swaps
Filename                                Type            Size    Used    Priority
/dev/mapper/VolGroup00-LogVol01         partition       2031608 0       -1

-OR-

# cat /proc/meminfo | grep SwapTotal
SwapTotal:     2031608 kB

If for some reason you do not have enough space in /tmp, you can temporarily create space in another file system and point your TEMP and TMPDIR to it for the duration of the install. Here are the steps to do this:

# su -
# mkdir /<AnotherFilesystem>/tmp
# chown root.root /<AnotherFilesystem>/tmp
# chmod 1777 /<AnotherFilesystem>/tmp
# export TEMP=/<AnotherFilesystem>/tmp     # used by Oracle
# export TMPDIR=/<AnotherFilesystem>/tmp   # used by Linux programs
                                           #   like the linker "ld"

# su -
# rmdir /<AnotherFilesystem>/tmp
# unset TEMP
# unset TMPDIR